From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Log sheet detailing the testing and performance of an A.T. Speedometer.
| Identifier | ExFiles\Box 50\4\ Scan227 | |
| Date | 23th August 1928 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS. x No:- 4308 A.T. Speedometer A246.745. 15/52 Date on. | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading finish. | Miles covered. | Total miles. 9-6-27 | Lab test | 2-7-27 | Received from makers as first instrument to be corrected for temperature | | | See report AS/RM {William Robotham - Chief Engineer} /LC | 18-6-27 2-7-27 | 12 EX | 20-8-27 | Tested see report | 00040 | 02694 | 2654 | 2654 20-8-27 | Lab test | 23-8-27 | EFC {E. Fowler Clarke - Electrical Engineer} / T23827 18°C 47.6 MPH | — | — | — | — 24-8-27 | 12 EX | 1-3-28 | Retested see report EFC. {E. Fowler Clarke - Electrical Engineer} | 02827 | 07002 | 4175 | 6832 1-3-28 | Lab | 3-3-28 | /4/T1328 No change from above | | | | 3-3-28 | 12 EX | 28-3-28 | Speedometer replaced with c/o B138 N730 15/52 | 07122 | 07311 | 189 | 7021 28-3-28 | Garage | 23-8-28 | In dirty condition | | | | No further record kept | ||